Stability of Unconventional Superconductivity on Surfaces of Topological Insulators

Details Stability of Unconventional Superconductivity on Surfaces of Topological Insulators Stability of Unconventional Superconductivity on Surfaces of Topological Insulators

2011-04-07

arxiv.org/abs/1104.1232v1

J. Phys. Soc. Jpn. 80 (2011) 063704

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1143/JPSJ.80.063704

Superconductivity on the surface of topological insulators is known to be anisotropic and unconventional in that the symmetry is the mixture of s-wave and nodeless p-wave component. In contrast to Anderson's theorem for the insensitivity of the s-wave superconducting critical temperature to the nonmagnetic (time-reversal symmetric (TRS)) impurities, anisotropic superconductors including nodeless p-wave one are in general fragile even with small concentration of the TRS impurities. By employing the Abrikosov-Gor'kov theory, we clarify that this type of unconventional superconductivity emergent on the surface state of the strong topological insulators robustly survive against TRS impurities.

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